diff --git a/reactos/drivers/filters/mountmgr/CMakeLists.txt b/reactos/drivers/filters/mountmgr/CMakeLists.txt
index 218d908f7a7..c1732e6fc43 100644
--- a/reactos/drivers/filters/mountmgr/CMakeLists.txt
+++ b/reactos/drivers/filters/mountmgr/CMakeLists.txt
@@ -10,7 +10,7 @@ list(APPEND SOURCE
     mntmgr.h)
 
 add_library(mountmgr SHARED ${SOURCE} mountmgr.rc)
-target_link_libraries(mountmgr wdmguid ioevent)
+target_link_libraries(mountmgr wdmguid ioevent memcmp)
 set_module_type(mountmgr kernelmodedriver)
 add_importlibs(mountmgr ntoskrnl hal)
 add_pch(mountmgr mntmgr.h SOURCE)
diff --git a/reactos/drivers/filters/mountmgr/mntmgr.h b/reactos/drivers/filters/mountmgr/mntmgr.h
index c2431699a0c..edf8c3b840c 100644
--- a/reactos/drivers/filters/mountmgr/mntmgr.h
+++ b/reactos/drivers/filters/mountmgr/mntmgr.h
@@ -16,12 +16,6 @@
 #endif
 
 /* Enter FIXME */
-#ifdef IsEqualGUID
-#undef IsEqualGUID
-#endif
-
-#define IsEqualGUID(rguid1, rguid2) (RtlCompareMemory(rguid1, rguid2, sizeof(GUID)) == sizeof(GUID))
-
 #define FILE_READ_PROPERTIES  0x00000008
 #define FILE_WRITE_PROPERTIES 0x00000010
 /* Leave FIXME */